Sometimes Mycroft pays a ridiculous amount of money to be spanked and humiliated.
"What do you say? Thank you sir, will you please spank me sir?" "Kneel boy and don't move until I give you permission." " Crawl to me, boy."
Afterwards he just wants be held and cuddled and having his hair stroked while he is assured that he did well. "I'm very proud of you. You did everything I asked of you. You were very brave."